Do people who work night shifts get the ‘winter blues’ more easily than people who work ‘nine till five’? Aye - anyone working nights who blocks out the daylight to sleep (which they probably have to do, otherwise their sleep will be even crappier than just resetting your body clock makes it) and so technically night shift workers can get "SAD" any time of the year. Which is part of why depression is more common in those working regular nights (in addition to the obvious effects on relationships, friendships etc). If someone is working nights during the winter, where there are less than 8 hours between sunrise and sunset, it's theoretically possible that they'll never see daylight while they're awake, so the chances of them suffering SAD are likely to be much higher. Just imagine what it must be like living north of the Arctic circle. I saw a TV program about Tromsø a few days ago. It's the northern most city in the world, and the sun doesn't rise for around 9 weeks in the winter and doesn't set for about the same amount of time in the summer. During the winter, they have no more than an hour or two of dusk, and they have a huge sun party on the first day the sun actually peeks over the horizon in January. On the one hand you have winter depression and the other you have summer insomnia!